The transportation of wastewater through sewer networks can cause potential problems due to the formation of lethal gases such as ammonia, carbon dioxide, hydrogen sulphide and methane. As a result, they can cause irr...The transportation of wastewater through sewer networks can cause potential problems due to the formation of lethal gases such as ammonia, carbon dioxide, hydrogen sulphide and methane. As a result, they can cause irritating, toxic, and microbial induced corrosion. The true depth of these problems can be measured by measuring the emission of such lethal gasses in the sewer atmosphere. The amount of gases released from such sewer networks has to be controlled. In this paper, we present a simple experimental methodology used to determine the emissions of Carbon Dioxide (CO2) and Hydrogen Sulphide (H2S) using Landtec GEM-2000 plus multi-gas analyser from wastewater wet wells.展开更多
Bioaerosols from wastewater treatment processes are a significant subgroup of atmospheric aerosols. In the present study,airborne microorganisms generated from a wastewater treatment station（WWTS） that uses an oxida...Bioaerosols from wastewater treatment processes are a significant subgroup of atmospheric aerosols. In the present study,airborne microorganisms generated from a wastewater treatment station（WWTS） that uses an oxidation ditch process were diminished by ventilation.Conventional sampling and detection methods combined with cloning/sequencing techniques were applied to determine the groups,concentrations,size distributions,and species diversity of airborne microorganisms before and after ventilation. There were 3021 ± 537 CFU/m3 of airborne bacteria and 926 ± 132 CFU/m3 of airborne fungi present in the WWTS bioaerosol.Results showed that the ventilation reduced airborne microorganisms significantly compared to the air in the WWTS. Over 60% of airborne bacteria and airborne fungi could be reduced after4 hr of air exchange. The highest removal（92.1% for airborne bacteria and 89.1% for fungi） was achieved for 0.65–1.1 μm sized particles. The bioaerosol particles over 4.7 μm were also reduced effectively. Large particles tended to be lost by gravitational settling and small particles were generally carried away,which led to the relatively easy reduction of bioaerosol particles0.65–1.1 μm and over 4.7 μm in size. An obvious variation occurred in the structure of the bacterial communities when ventilation was applied to control the airborne microorganisms in enclosed spaces.展开更多
文摘The transportation of wastewater through sewer networks can cause potential problems due to the formation of lethal gases such as ammonia, carbon dioxide, hydrogen sulphide and methane. As a result, they can cause irritating, toxic, and microbial induced corrosion. The true depth of these problems can be measured by measuring the emission of such lethal gasses in the sewer atmosphere. The amount of gases released from such sewer networks has to be controlled. In this paper, we present a simple experimental methodology used to determine the emissions of Carbon Dioxide (CO2) and Hydrogen Sulphide (H2S) using Landtec GEM-2000 plus multi-gas analyser from wastewater wet wells.
基金financially supported by the National Key Technology R & D Program of China (No.2012BAC13B04-08)the National Natural Science Foundation of China (Nos.51178451 and 51221892)
文摘Bioaerosols from wastewater treatment processes are a significant subgroup of atmospheric aerosols. In the present study,airborne microorganisms generated from a wastewater treatment station（WWTS） that uses an oxidation ditch process were diminished by ventilation.Conventional sampling and detection methods combined with cloning/sequencing techniques were applied to determine the groups,concentrations,size distributions,and species diversity of airborne microorganisms before and after ventilation. There were 3021 ± 537 CFU/m3 of airborne bacteria and 926 ± 132 CFU/m3 of airborne fungi present in the WWTS bioaerosol.Results showed that the ventilation reduced airborne microorganisms significantly compared to the air in the WWTS. Over 60% of airborne bacteria and airborne fungi could be reduced after4 hr of air exchange. The highest removal（92.1% for airborne bacteria and 89.1% for fungi） was achieved for 0.65–1.1 μm sized particles. The bioaerosol particles over 4.7 μm were also reduced effectively. Large particles tended to be lost by gravitational settling and small particles were generally carried away,which led to the relatively easy reduction of bioaerosol particles0.65–1.1 μm and over 4.7 μm in size. An obvious variation occurred in the structure of the bacterial communities when ventilation was applied to control the airborne microorganisms in enclosed spaces.
